linux-kernel - [PATCH 0/2] x86: Discard .note.gnu.property sections

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Message-Id: <20200124181819.4840-1-hjl.tools@gmail.com>
Date:   Fri, 24 Jan 2020 10:18:17 -0800
From:   "H.J. Lu" <hjl.tools@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH 0/2] x86: Discard .note.gnu.property sections

With the command-line option, -mx86-used-note=yes, the x86 assembler
in binutils 2.32 and above generates a program property note in a note
section, .note.gnu.property, to encode used x86 ISAs and features.  But
x86 kernel vmlinux and vDSO linker scripts only contain a signle NOTE
segment which may not be incompatible with note.gnu.property sections.
Since note.gnu.property section from kernel are unused, they should be
discarded by adding

/DISCARD/ : {
 *(.note.gnu.property)
}

before .notes sections.

H.J. Lu (2):
  x86: Discard .note.gnu.property sections in vDSO
  x86: Discard .note.gnu.property sections in vmlinux

 arch/x86/entry/vdso/vdso-layout.lds.S |  4 ++++
 arch/x86/kernel/vmlinux.lds.S         | 11 +++++++++++
 2 files changed, 15 insertions(+)

-- 
2.24.1